216814443 has 4 divisors (see below), whose sum is σ = 289085928. Its totient is φ = 144542960.

The previous prime is 216814397. The next prime is 216814459. The reversal of 216814443 is 344418612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216814443 - 2⁹ = 216813931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216819443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36135738 + ... + 36135743.

It is an arithmetic number, because the mean of its divisors is an integer number (72271482).

Almost surely, 2^216814443 is an apocalyptic number.

216814443 is a deficient number, since it is larger than the sum of its proper divisors (72271485).

216814443 is an equidigital number, since it uses as much as digits as its factorization.

216814443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72271484.

The product of its digits is 18432, while the sum is 33.

The square root of 216814443 is about 14724.6203007072. The cubic root of 216814443 is about 600.7531680564.

The spelling of 216814443 in words is "two hundred sixteen million, eight hundred fourteen thousand, four hundred forty-three".